For the making of tools, prehistoric man had a broad spectrum of raw materials: quartz, quartzite, chert, flint,etc., each with its own characters for the making of tools.Chert has great similarities with flint, as both are cryptocrystalline and microfibrous enclosed sedimentary rocks
Contrary to flint, chert is not very suitable for the making of very small blades,but, as it is hard-grained it suits very well for the production of more heavy duty tasks, such as cleavers, axes and hammer-stones.After all, flint of a good fine quality would easily break if the applied forces were too big.
Chert from the region of Neufchâteau in France, department Vosges (.88 ) ( location in Google Maps) has been used for the production of stone tools.The chert is of the Oxfordian horizons from the lowest stage of the Upper -Jurrassic ( 155,7 Mya –161,2 Mya) (Gradstein, Ogg & Smith, 2004)., right below the oldest cretaceous horizons.of the Berriasian.Tools made of such a raw material were reported by Serge Beguinot from France, who had detected them in the outcrop inthe geological layers ofthe Oxfordian- Kimmeridgian( a grey colored calcareous clay containing chert) (1) but not atrace of it on the plateaus except insomewell-localizedoranthropogenic influenced locations.The stone age tools most often are of a pre- Neolithic date, mainly form the Palaeolithic( see also finds of palaeolithic tools made of chertfrom the Indre, article byCharbonnier, 1950 ) but Mesolithic tools were found as well (see also Hind, Chert Use in the Mesolithic) Among the finds, a Neolithic stone axe head was found. In the region around Visé -Caster in the Belgian Wallon,ca 320 km north of the French city of Neufchâteau , tool from similar chert can be found.

Same stone tool production?
Similar finds of such tools were noticed by the author and others from the Belgian Hesbaye region. iI communities of Visé -Caster location PLC-B, and the community of Eben Emael and Wonck at locations EBE and LAN, which is located over 300 km to the north but near the same river (Maas), similar tools were noticed.
These tools were also made of a grey chert type and have the same appearance both in granularity as in patina.

Not only the used material looks similar, but also lots of shapes of the artifacts are almost the same. 1 and 2: pointed tools from the region of Neufchateau, France, and 3 pointed tool from Eben Emael LAN

The problem is, the Upper- Jurassic Oxfordian is not at all visible at the location of Eben -Emael. / Visé Caster in Belgium.
Outcrops of the Upper -Jurassic along the the Maas river can be found in the area southwest of Toul and southeast of Sedan in Northern France ( Bosch, 1992). But small Upper -Jurassic outcrops west and northwest of the Belgian city of Namur and southwest of Liege are more likely to be the original location where the Jurassic outcrop has been incised by the Maas river.
The artifacts at the fields in the communities of Visé - Caster and Eben- Emael however have dimensions ( and thus a big weight) that is suggesting use of local chert, but they also could have been transported.
An alternation of bedsconsisting ofmarl limestoneandchalkbedsrich inchert, are laying right above the Oxfordian horizon, so outcrops of this material could locally occur in the Hesbaye region. This suggestion is based on the numerous finds of artifacts made of such chert too much to be imported, see the two images below.

The large tools found on fields in the communities of Visé -Caster and Eben- Emael and Wonck have an appearance and weathering, which is suggesting manufacture and use during the Palaeolithic (Late-Acheuléen? see Janot, 1988).
Other tools are most likely from the Neolithic period, and one of the tools has been polished and could be identified as a late Neolithic, polished axe (see image below)Lesgrands outilstrouvéssur les champsdans les communautés deVisé-CasteretEben-EmaeletWonckont une apparenceet l'altération, ce quisuggère la fabrication et l'usageau coursdu Paléolithique(Acheuléen- superieure? VoirJanot, 1988).

Cionclusion...
At two locations 320 km separated of each other, a similar prehistoric industry occurs. This industry uses chert as the raw material for the production of tools.
Not only the chert looks very much the same, the appearance of the tools also spread big similarities.
It is important, during field prospections, non flint materials, such as chert are noticed as a raw material source, to have a better understanding for the choice of this raw material by prehistoric man for the production of his tools.

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Ken Johnston: Portable Rockart

Prehistoric people made art, not only by means of wall paintings in caves, but also creating or collecting small objects like heads, figurines, ducks, mammouths, etc. of wood, bone, antler... and stone.

These ( small) objects fit in a nomadic life- style and were easy to transport.

Many examples and links can be found at the website of Ken Johnston from Ohio (USA) about portable rockart